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# Science Arbaji WEMS

### WEMS SCIENCE 7A

Question | Answer |
---|---|

The fraction of parent isotope to daughter isotope after 5 half life is always ____. | 1/32 |

Argon, Calcium, and Carbon-12 are all types of what? | Daughter Isotope |

The time it takes for parent material to be decreased by ½ | Half Life |

When unstable isotopes break down into stable isotopes, this is know as __ | Radioactive Decay |

An unstable isotope is the (parent/daughter) isotope | Parent |

Knowing the age of modern human fossils or artifacts can be determined by which radioactive element? | Carbon-14 |

Lead-208 is a stable isotope. Which is older??? Rock “A” → It contains 25% Lead-208 Rock “B” → It contains 50% Lead-208 | Rock B: 50% |

What is radioactive decay? | Unstable isotopes change into stable isotopes at a predictable pace. |

A stable isotope is the (parent/daughter) isotope. | Daughter |

The ratio of parent isotope to daughter isotope after 1 half life is always_____. | 1:1 |

True or False: Stable isotopes always turn into unstable isotopes. | False |

The fraction of parent isotopes after 3 half lifes is always | 1/8 |

Uranium-238, Potassium-40 and Carbon-14 are all what? | Parent Isotopes. |

Half of Uranium,-238 decays to Lead-206 in 4.5 billion years. What is the half life of lead-236? | You are not able to tell by the information given because it is a stable isotope already. |

The fraction of parent isotope to daughter isotope is always ______ after 4 half lifes. | 1/16 |

Knowing the age of rocks as old as the planet can be determined by which radioactive element? | Uranium-238 |

During radioactive decay, atoms change at a (predictable/random) pace. | Predictable |

The ratio of parent to daughter isotopes after 3 half lifes is always 1:____ | 1:7 |

If the fraction of parent to daughter is 1/8, how many half lifes has it been through? | 3 half lifes. |

Rubidium-87 is an unstable isotope. Which is older??? Rock “A” → It contains 25% Rubidium-87 Rock “B” → It contains 50% Rubidium-87 | Rock A. |

The ratio of parent to daughter isotopes is always ___________ after 4 half lifes? | 1:15 |

The fraction of parent isotope to daughter isotope after 2 half lifes is always ________________. | 1/4 |

The ratio of daughter to parent after 2 half lifes is always______. | 3:1 |

Knowing when ancestors of humans were living can be determined by which radioactive element? | Potassium-40 |

What is an isotope. | Another form of an atom. |

Created by:
olivia.manos